Volley Library:
If you look on github for most popular mirrors of the VolleyLibrary you'll find the DWorkS VolleyPlus and the McXiaoke of which the first one has some added functionality like additional Request types and image caching.

You can read more about them at:
* https://github.com/mcxiaoke/android-volley
* https://github.com/DWorkS/VolleyPlus